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Meaning of PLANETARY NEBULA
Pronunciation:
'plani`teree'nebyulu
WordNet Dictionary
Definition:
[n]
a
nebula
that
was
once
thought
to
be
a
star
with
its
planets
but
is
now
thought
to
be
a
very
hot
star
surrounded
by
an
expanding
envelope
of
ionized
gases
that
emit
a
fluorescent
glow
because
of
intense
radiation
from
the
star
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See Also:
nebula
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